<!-- 放置在 body 中 -->
<div class="balloon-container"></div>

<audio id="bgm" autoplay loop>
    <source src="{{ url_for('static', filename='carefree.mp3') }}" type="audio/mpeg">
    <!-- Your browser does not support the audio element. -->
  </audio>
  
  <button id="bgmToggle" style="position: fixed; top: 20px; right: 20px; z-index: 999;">
    🔊
  </button>
  
  <script src="{{ url_for('static', filename='scripts/audio.js') }}"></script>